But sometimes getting 70% larger sample will cost you so much money, that you'd need another grant, one you'd get after you'd publish your p=0.05 result, which given the new rules you'd not be able to publish...

Statistics is just another method and almost every method can be hacked or abused. Science is not about putting checkmarks in tables but about reading and understanding ideas and reproducing the results. Tweaking some numeric values is not going to help the review process which is fundamentally broken these days.